Fix fdo#64972 - strikethrough displays too high

I was calculating the leading before setting the ascent and descent,
oops.

Change-Id: Ic58ecb1a65cb33715ea06f5e3214c4acbcff1e40

vcl/generic/glyphs/gcach_ftyp.cxx

@@ -940,7 +940,6 @@ void ServerFont::FetchFontMetric( ImplFontMetricData& rTo, long& rFactor ) const
     rTo.mnDescent = 0;
     rTo.mnExtLeading = 0;
     rTo.mnSlant = 0;
-    rTo.mnIntLeading = (rTo.mnAscent + rTo.mnDescent) - ((maFaceFT->units_per_EM + 32) >> 6);
     rTo.mnWidth = mnWidth;
 
     // Calculating ascender and descender:
@@ -994,6 +993,8 @@ void ServerFont::FetchFontMetric( ImplFontMetricData& rTo, long& rFactor ) const
         }
     }
 
+    rTo.mnIntLeading = (rTo.mnAscent + rTo.mnDescent) - ((maFaceFT->units_per_EM + 32) >> 6);
+
     if( pOS2 && (pOS2->version != 0xFFFF) )
     {
         // map the panose info from the OS2 table to their VCL counterparts